package lab02.Test36;

/**
 * Created by Administrator on 2017/11/15.
 */
    public  class Postgraduate extends Student{
        @Override
        String calGrade() {
            double avg=calAverage();
            if(avg>=90&&avg<=100)
                grade="优秀";
            else if(avg>=80&&avg<90)
                grade="良好";
            else if(avg>=70&&avg<80)
                grade="一般";
            else if(avg>=60&&avg<70)
                grade="及格";
            else
                grade="不及格";
            return grade;
        }
    }

